Substance P Identified as Key Driver of Immune Imbalance in Chronic Allergic Conjunctivitis

Researchers investigating chronic allergic conjunctivitis have identified substance P, a neuropeptide associated with inflammation and pain, as a key factor in immune system imbalances and damage to the ocular surface. The study, conducted by Bao et al., highlights the role of substance P in influencing the balance between Th17 cells and regulatory T cells (Tregs), two critical components of the immune system. This imbalance is linked to inflammation and tissue damage observed in chronic allergic eye conditions.

The findings suggest that substance P contributes to an increase in Th17 cell activity while suppressing Treg function, creating an environment conducive to prolonged inflammation. This dysregulation may exacerbate ocular surface damage commonly seen in patients with chronic allergic conjunctivitis. The research provides further insight into the underlying mechanisms driving immune responses in such conditions and underscores the potential impact of neuropeptides like substance P on both immune regulation and tissue health.

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Date: December 1, 2025

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